Solenoid pump



Sept. Z3, 1941. C.;- p METESKY l 2,2579959 SOLENOID PUMP Filed July 19, 193s WITNESS ATTORNEYS Patented Sept. 23, 1941 UNITED STATES PATENToFFlcE 2,257,959 soLENom PUMP George P. Metesky, Waterbury, Conn. v Application July 19,1998, serai 120.229.982 1 claim. (ci. 172-126) This invention relates to solenoid pumps and has for an object to provide 'a device oi this character having a reciprocating circuit breaker for positively making and breaking the circuit to the solenoid.

' A further object is to provide a device of this character in which the circuit breaker is sclenoid `operated to closed circuit position and is spring retracted to open circuit position after each operation of the solenoid.

A further object is to provide a device of this character which will be formed of a few strong simple and durable parts, which will be inexpensive to manufacture, and which will not easily get out of order. With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that' various modifications may be resorted to within the scope of the appended claim without departing form the spirit or sacrificing any of the advantages of the invention. In the accompanying drawing forming part of this specification,

Figure 1 is a longitudinal sectional view of a solenoid 4pump constructed in accordance with l y ure 1'.

Figure 3 is a diagrammatic view showing the electrical connections of the pump.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, the solenoid pump is shown to'coinprise a solenoid l0 having a core Il in the iormof a pump piston. One end of the solenoid'fis sealed by a plug cap I2 which is provided with an air intake valve I3 and an air outlet valve I4, these valves being provided with respective ball checks I5 and I6.

The housing I1 of the solenoid extends beyond the winding thereof and contains make and break switch mechanism comprising a lever I8 which is pivoted intermediate its ends on a pivot pin i9 carried by an arm 20 one end of which is provided with a curved attaching foot 2| which. is secured to the pump cylinder 22 upon which the solenoid is Wound and through the medium of screws 23 in Figure 2.

Securedto a lug 24 which projects from the outer end of the arm 20 is a contact point 25 which is connected by a conductor wire 28 to one end of the Winding of the solenoid. The opposite end of the winding is grounded on any of the metal parts such as the pump cylinder 2 2 or housing I1. The contact point 25 coacts with a similar contact point 21 on the outer end of the pivoted lever. to complete the circuit to the solenoid. A condenser 28 is connected across the contact points 25 and 21 as best shown in Figure 2 to prevent arcing. Circuit wires 28 and 30 are connected respectively to the contact point 21 and to the attaching foot of the arm 23 and may be connected to any suitable source of electric current.

Secured on the underside of the lever I8 through the medium o! rivets 3| is a ilat leaf spring both ends of which are curved outwardly The pump piston is proy and 21 the piston is forced outwardly to initial position through the medium of a helical compression spring 34 which-is housed in a casing 35 which is secured in any preferred manner to the end wall 3G of the solenoid. The spring is sleeved upon a plunger.31 carried by an arm 38 which is secured to the end of a piston through the medium of a screw 39, best shown in Figure 2. 'I'he spring 34 is compressed against its housing 35 during movement of the piston into the solenoid and immediately returns the piston to initial position after the solenoid is de-energized.

Good contact between points 25 and 21 is maintained by magnetic action of the solenoid core Il pulling at the enlarged end 39 of the lever I8.

When the piston is returned by the spring to initial position the cam lug 33 engages the curved outer end of the leaf spring 32 and again swings vthe lever I8 to effect engagement of the contact dinal slot in the projecting end of the casing. a'

core for the solenoid movable in one direction into the solenoid and movable in the opposite direction into the slotted end of the casing, a lug of insulating material on one end of the core projecting through said slot, a metal lever pivoted intermediate its ends in the projecting end of the housing and extending longitudinally of the slot in the casing, a stationary contact point carried by the easing, o. movable contact on one end of the lever, seid contacts being electrically connested to the solenoid for closing a circuit tlnougn the solenoid, s, leaf spring secured to extending iomitucinaliy of the lever having its enf-.e curved away from the lever and adapted to 'oe alternately engaged by said lug to move the contact points to open circuit and to closed circuitposltion, an enlarged end on the lever adjacent to the end of the solenoid attracted by the solenoid when energized to hold the contacts in good electrical engagement, there being a second longitudinal slot in the projecting end of the casing, an arm secured to the end of Nche score near said lug and projecting through the second slot, and a compression spring between the arm and solenoid adapted to be compressed when the core is drawn into the solenoid for returning the core to its outward limit oi movement beyond the solenoid to move said contacts into circuit closing position.

GEORGE P. ME'I'ESKY. 

